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Supplemental Financial Information - Cash, Cash Equivalents and Restricted Cash (Detail) - USD ($) $ in Millions	Jul. 26, 2019	Apr. 26, 2019	Jul. 27, 2018	Apr. 27, 2018
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]
Cash	$ 2,858	$ 2,216
Cash equivalents	109	109
Cash and cash equivalents	2,967	2,325
Short-term restricted cash	5	5
Long-term restricted cash	1	1
Restricted cash	6	6
Cash, cash equivalents and restricted cash	$ 2,973	$ 2,331	$ 2,633	$ 2,947

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